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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2021 ARM Limited
*
* Verify that the SVE register context in signal frames is set up as
* expected.
*/
#include <signal.h>
#include <ucontext.h>
#include <sys/prctl.h>
#include "test_signals_utils.h"
#include "testcases.h"
static union {
ucontext_t uc;
char buf[1024 * 64];
} context;
static unsigned int vls[SVE_VQ_MAX];
unsigned int nvls = 0;
static bool sve_get_vls(struct tdescr *td)
{
int vq, vl;
/*
* Enumerate up to SVE_VQ_MAX vector lengths
*/
for (vq = SVE_VQ_MAX; vq > 0; --vq) {
vl = prctl(PR_SVE_SET_VL, vq * 16);
if (vl == -1)
return false;
vl &= PR_SVE_VL_LEN_MASK;
/* Skip missing VLs */
vq = sve_vq_from_vl(vl);
vls[nvls++] = vl;
}
/* We need at least one VL */
if (nvls < 1) {
fprintf(stderr, "Only %d VL supported\n", nvls);
return false;
}
return true;
}
static void setup_sve_regs(void)
{
/* RDVL x16, #1 so we should have SVE regs; real data is TODO */
asm volatile(".inst 0x04bf5030" : : : "x16" );
}
static int do_one_sve_vl(struct tdescr *td, siginfo_t *si, ucontext_t *uc,
unsigned int vl)
{
size_t offset;
struct _aarch64_ctx *head = GET_BUF_RESV_HEAD(context);
struct sve_context *sve;
fprintf(stderr, "Testing VL %d\n", vl);
if (prctl(PR_SVE_SET_VL, vl) == -1) {
fprintf(stderr, "Failed to set VL\n");
return 1;
}
/*
* Get a signal context which should have a SVE frame and registers
* in it.
*/
setup_sve_regs();
if (!get_current_context(td, &context.uc, sizeof(context)))
return 1;
head = get_header(head, SVE_MAGIC, GET_BUF_RESV_SIZE(context),
&offset);
if (!head) {
fprintf(stderr, "No SVE context\n");
return 1;
}
sve = (struct sve_context *)head;
if (sve->vl != vl) {
fprintf(stderr, "Got VL %d, expected %d\n", sve->vl, vl);
return 1;
}
/* The actual size validation is done in get_current_context() */
fprintf(stderr, "Got expected size %u and VL %d\n",
head->size, sve->vl);
return 0;
}
static int sve_regs(struct tdescr *td, siginfo_t *si, ucontext_t *uc)
{
int i;
for (i = 0; i < nvls; i++) {
if (do_one_sve_vl(td, si, uc, vls[i]))
return 1;
}
td->pass = 1;
return 0;
}
struct tdescr tde = {
.name = "SVE registers",
.descr = "Check that we get the right SVE registers reported",
.feats_required = FEAT_SVE,
.timeout = 3,
.init = sve_get_vls,
.run = sve_regs,
};
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